Fig. 1From: Effect of diurnal temperature range on emergency room visits for acute upper respiratory tract infectionsTime series plot of (a) emergency room (ER) visits for upper respiratory tract infections (URI) (number of daily cases), (b) diurnal temperature range (DTR), (c) average temperature, (d) relative humidity, (e) particulate matter with a median aerometric diameter < 10 microns (PM10), and (f) ozone (O3) in Seoul, Korea, 2009 to 2013Back to article page